kcidb: handle test-case without a build_id
kcidb: handle test-case without a build_id

If there is no build in the db for the test group, then there is no
valid build_id, so do not push to kcidb.

Signed-off-by: Kevin Hilman <f9849b02abe18c1ece6bd40346458ed53f49d31b@baylibre.com>

kernelci/kernelci-backend,kernelci/kernelci-backend